Collie, 27, is working his way back from surgery to repair a ruptured patella tendon in his right knee, an injury he suffered last season with the Indianapolis Colts.

Collie also has a history of concussions, three in total, the most recent coming during the 2012 preseason. He told USA Today last week that he was willing to risk a permanent brain injury to continue his football career.

"I'll sign a waiver, all right?" he said. "They're not going to have to worry about me suing. I'll hold myself to be accountable."